jyablonski / arc

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feat: add ai sessions and ai health commands (#29)

## Description

Add two read-only, offline `arc ai` subcommands for AI-tooling
observability: `ai sessions` (browse/resume recent Claude and Codex
sessions) and `ai health` (auth, tooling, and local-config health across
Claude, Codex, and Cursor).

### Added

- `arc ai sessions`: lists recent local sessions newest-first (project,
model, tokens, title) with
`--provider`/`--since`/`--until`/`--limit`/`--search`/`--resume`/`--json`,
reusing the existing token-log traversal.
- `arc ai health`: offline checks for provider auth/token expiry, CLIs
on PATH, pricing-cache freshness, and skills/rules sync — grouped as a
data table with hint footnotes; exits non-zero on failure.

### Updated

- Factored a shared provider-filter parser and `ai.FirstLine` helper;
README command table documents both commands.

358 of 683 new or added lines in 10 files covered. (52.42%)

4552 of 6321 relevant lines covered (72.01%)

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